2. Chronic coronary artery disease with coronary Stenosis detectable by percutaneous coronary intervention (PCI). Ineligibility for percutaneous revascularization, as assessed by coronary arteriography. Ineligibility for percutaneous revascularization procedures was determined by 2 expert committees: a surgical committee comprising 2 cardiovascular surgeons and a noninvasive cardiologist, and an interventional committee comprising 2 interventional cardiologists and 1 noninvasive cardiologist.